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Commit 1ca7003a authored by Davidlohr Bueso's avatar Davidlohr Bueso Committed by Linus Torvalds
Browse files

ipc: introduce ipc object locking helpers 



Simple helpers around the (kern_ipc_perm *)->lock spinlock.

Signed-off-by: default avatarDavidlohr Bueso <davidlohr.bueso@hp.com>
Cc: Andi Kleen <andi@firstfloor.org>
Cc: Rik van Riel <riel@redhat.com>
Signed-off-by: default avatarAndrew Morton <akpm@linux-foundation.org>
Signed-off-by: default avatarLinus Torvalds <torvalds@linux-foundation.org>
parent dbfcd91f

ipc/util.h

+15 −5
Original line number Diff line number Diff line
@@ -159,23 +159,33 @@ static inline int ipc_checkid(struct kern_ipc_perm *ipcp, int uid) 
	return uid / SEQ_MULTIPLIER != ipcp->seq;

}



static inline void ipc_lock_by_ptr(struct kern_ipc_perm *perm)

static inline void ipc_lock_object(struct kern_ipc_perm *perm)

{

	rcu_read_lock();

	spin_lock(&perm->lock);

}



static inline void ipc_unlock(struct kern_ipc_perm *perm)

static inline void ipc_unlock_object(struct kern_ipc_perm *perm)

{

	spin_unlock(&perm->lock);

	rcu_read_unlock();

}



static inline void ipc_lock_object(struct kern_ipc_perm *perm)

static inline void ipc_assert_locked_object(struct kern_ipc_perm *perm)

{

	assert_spin_locked(&perm->lock);

}



static inline void ipc_lock_by_ptr(struct kern_ipc_perm *perm)

{

	rcu_read_lock();

	spin_lock(&perm->lock);

}



static inline void ipc_unlock(struct kern_ipc_perm *perm)

{

	spin_unlock(&perm->lock);

	rcu_read_unlock();

}



struct kern_ipc_perm *ipc_lock_check(struct ipc_ids *ids, int id);

struct kern_ipc_perm *ipc_obtain_object_check(struct ipc_ids *ids, int id);

int ipcget(struct ipc_namespace *ns, struct ipc_ids *ids,